Record details

Title
    Analysis of low concentration of free ferric oxides in clays by Vis diffuse reflectance spectroscopy and voltrammetry
Statement of responsibility
    Tomáš Grygar, Jiří Dědeček, David Hradil
Other titles
    Mid-European Clay Conference '01, Stará Lesná, 9-14 September 2001, Slovak Republic (Variant.)
Author
    Dědeček, Jiří
    Grygar, Tomáš, 1964-
    Hradil, David
Language
    anglicky
Source title - serial
    Geologica carpathica
Vol./nr.
    Vol. 53, no. 2
Pages
    p. 71-77
Year
    2002
Notes
    1 obr., 2 diagr., 5 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Geol. carpath.
Classfication no.
    549
    553.5/.8
Conspectus category
    549
    553
Subject group
    jíl
    ložisko bentonitu
    minerály jílové
    spektroskopie optická
    studie experimentální
    voltametrie
    železo
Geographical name
    ČR-Čechy
    Rokle (Chomutov, Kadaň)
Keyword
    Analysis
    Clays
    Concentration
    Diffuse
    Ferric
    Free
    Low
    Oxides
    Reflectance
    Spectroscopy
    Vis
    Voltrammetry
Abstract (in english)
   Ferric oxide admixtures in the concentration range 0.1-10 per cent in soils, sediments, and clay mineral samples can be conveniently characterized by Vis diffuse reflectance spectroscopy (DRS) in the region of d-d electron transitions close to 500 nm, voltammetry of microparticles, and voltammetry with carbon paste electroactive electrode (CPEE). DRS also detects Fe(III) in the clay mineral matrix equally sensitively. Voltammetry of microparticles is suitable for direct detection of free crystalline and amorphous ferric oxides. The determination limit of total free ferric oxides with CPEE is about 0.01per cent. The techniques were tested with six clay mineral samples. XRD was able to detect free FeOOH in only one of them (1.6 per cent), DRS and CPEE also detected 0.19 per cent FeOOH in Be-3 (bentonite of Rokle deposit, Bohemia) and 0.04 per cent in reference montmorillonite SWy-2
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012